Programmer message

Go to the parking lot where you had to take out the men with bombs
on their chests. Use the Dodo or a pile of cars to get on the
other side of the wall that surrounds the area. Once in there,
look for a poster with the secret message.

Fire truck message

Get a fire truck to see the message "Putting out since 1872"
near the bumper.

Look at either side of a fire truck to see the message "Don't
burn in silence... Call 911".

Newspapers

Take a look at the newspapers that float around on the streets.
There are two different types. One has the same page of articles
as the page in the instruction manual, with circles around some
of them. The other newspaper has a picture of Elvis with glowing
eyes with the words "Elvis Zombie Found" followed by
"Win shit". ,
, and

Wanted posters

Get a high wanted level and look down at the ground to find posters
that will look like your character.

Chatterbox callers

On rare occasions you can hear Tony from some of your missions in Portland call in to Chatterbox. He tells the host Lazlow about his mother treating him like a kid. You have to listen carefully because Tony tells Lazlow to call him sir, so nobody can tell it is him calling. Lazlow will only say Tony couple of times. Note: He is the guest that Lazlow tells to stop cussing because Chatterbox is a family radio station.

While listening to Chatterbox someone will call and say "Liberty
City Cocks rule", which refers to the football team in the
stadium message.

On the radio station Chatter Box, you can hear your girlfriend
Maria call in asking Lazlow for advice on guys. She is the hyper-active
one that suggests that Lazlow is gay.

Listen to the girl that is in the organization called Citizens
Raging Against Phones (CRAP) and wait for her to say "it's
hard organizing meetings without phones. We had to resort to carrier
pigeons and they keep disappearing." Keep listening to Chatterbox.
A short time later, you will hear a redneck talk about animals
he eats, such as like zebras, squirrels, raccoons, pigeons, etc.
He will say "Pigeons are good too. Sometimes they come with
little notes attached. It's like a fortune cooking with wings."
The reason the founder of CRAP's pigeons kept disappearing is
because the redneck found and ate them.

Dormatron commercial

Listen to the radio and eventually you will hear a
commercial for the Dormatron, an exercise machine. After the
wife says "Now that I've lost 280 pounds, my husband's all
mine again!" the husband will say, "That's right, honey,
no more escort services for me!" It is the voice of the man
you have to escort to Pike Creek for Donald Love.

Police radio message

When in a police car, listen at the police radio. Strangely,
a woman says, "One thousand chestnuts".

Web sites

The web sites mentioned on the radio stations during
the game actually exist. Examples include "www.petsovernight.com",
"www.pogothemonkey.com", "www.sleepofflard.com",
"www.lovemedia.tv", and "www.hiphophoneys.com".
,
, and

There is a web site on the sign for the car lot in Portland that
reads "www.dma-design.com/gta3/bonus.htm", but the actual
web page does not exist.

At St. Francis Airport, look at one of the buildings to see three
moving billboards. If you keep watching one of them, you will
see "www.dma-design/gta3/secret.htm" appear, but the
actual web page does not exist.

Go to the "www.kentpaul.com" web site to enter what
at first appears to be a site dedicated to the 80's. After surfing
through it, you will find that it is a secret site for the upcoming
sequel, Grand Theft Auto: Vice City which happens to take
place in the aforementioned era.

Grand Theft Auto 2 reference

PlayStation2 Steal a Mr. Whoope ice cream truck. Press R3
or L3 to hear it play music from Grand Theft Auto 2.

Grand Theft Auto: Vice City reference

Coming from Portland to Staunton Island, drive directly off the
bridge and continue going straight. At the Belleville Park intersection,
there are three large signs near the water. The last sign on the
right is a Francis International Airport sign hinting at the game's
sequel, with the message, "See You in Miami" written
on it.
and

When you finish all your missions with Ray and you go to his lock
up, it says "See you in Miami" on the beeper.

When you are at your hideout in Portland, use your sniper rifle.
Zoom in inside your hideout to see a "Getaway" poster
with a picture of palm trees and a sunset.

Liar Liar reference

While listening to LIPS 106's turning a commercial,
you will hear a guy say "Yes!" very loudly. That is
Jim Carey's voice from Liar Liar.

Scareface reference

On the Flashback radio station, all the songs that are played
are in the movie Scarface.